That would seem to imply to me that GNU is useless for match play. Which
seems to be exactly the case here.
As I see it the bottom line is GNU 1-ply gives
GNU Backgammon Position ID: gwEAQCoAAAAAAA
Match ID : cAmgACAAGAAA
+24-23-22-21-20-19------18-17-16-15-14-13-+ O: gnubg
OOO | O O | | | 2 points
OO | O O | | |
OO | | | |
OO | | | |
OO | | | |
| |BAR| |v 5 point match (Cube: 1)
XX | | | |
XX | | | |
XX | | | |
XX | | | | On roll
XXX | X X X X | | | 3 points
+-1--2--3--4--5--6-------7--8--9-10-11-12-+ X: Neil
Cube analysis
1-ply cubeless equity +0.434 (Money: +0.434)
0.717 0.000 0.000 - 0.283 0.000 0.000
Cubeful equities:
1. Double, take +0.731
2. Double, pass +1.000 ( +0.269)
3. No double +0.725 ( -0.006)
Proper cube action: Double, take
Its equivalent XG 2-ply gives:
Analyzed in 2 ply
Player Winning Chances: 73.54% (G: 0.00% B: 0.00%)
Opponent Winning Chances: 26.46% (G: 0.00% B: 0.00%)
Cubeless Equities: No Double=+0.471, Double=+1.549
Cubeful Equities:
No Double: +0.566 (-0.311)
Double/Take: +0.877
Double/Drop: +1.000 (+0.123)
Best Cube action: Double / Take
XG can give a reliable rollout in no time, showing that any lookahead can
give the correct figure for D/T after factoring in the automatic recube:
Analyzed in Rollout
Player Winning Chances: 73.54% (G: 0.00% B: 0.00%)
Opponent Winning Chances: 26.46% (G: 0.00% B: 0.00%)
Cubeless Equities: No Double=+0.471, Double=+1.549
Cubeful Equities:
No Double: +0.626 (-0.251)
Double/Take: +0.877
Double/Drop: +1.000 (+0.123)
Best Cube action: Double / Take
Rollout
20736 Games rolled with Variance Reduction.
Moves and cube decisions: 3 ply
Confidence No Double: ± 0.003 (+0.623<E<+0.630)
Confidence Double: ± 0.000 (+0.877<E<+0.877)
Double Decision confidence: 100.0%
Take Decision confidence: 100.0%
Duration: 1.4 seconds
And yet GNU 7-ply is even more useless:
Cube analysis
7-ply cubeless equity +0.387 (Money: +0.387)
0.694 0.000 0.000 - 0.306 0.000 0.000
Cubeful equities:
1. No double +0.600
2. Double, pass +1.000 ( +0.400)
3. Double, take +0.544 ( -0.056)
Proper cube action: No double, take (12.3%)
----- Original Message -----
From: "Christian Anthon" <[email protected]>
To: "Neil Robins" <[email protected]>
Cc: "Michael Petch" <[email protected]>; <[email protected]>
Sent: Saturday, September 05, 2009 12:29 PM
Subject: Re: [Bug-gnubg] Use of Two-Sided DB in matches
On Sat, Sep 5, 2009 at 8:11 AM, Neil Robins<[email protected]>
wrote:
Surely, therefore, at least 1-ply or higher should see the recube and the
then dead cube situation and go to the DB for an exact valid value.
The plays are cubeful as well and therefore only valid for moneygame.
Christian.
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